Keyboard



FIG. 1 is a top and front perspective view of a keyboard showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is rear elevation view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a keyboard, as shown and described. 